Being a pilot, I feel the need to chime in here. What I have found is the remaining air in your chamber is at whatever altitude you were at when you took off. As you climb up, so does the cabin altitude inside the airplane. Airlines wont pressurize the cabin as much as they can to reduce stresses imposed on the fuselage by repeated pressurization cycles 6 or 7 times a day. So, they typically only allow the cabin to only go as low as about 7-9 thousand feet. Now if you left sea level and climbed up, your tank pressurizes and floods out the wicks. What I have learned that works for me, is to turn the tank upside down (protank) and unscrew the end a turn or two. Then after the cabin altitude levels off, I screw it back down and vape away. Now the door is closed so you cant see me. lol My suggestion on the long hauls, go stand in the lav and get your vape on. But leave your cheech and chong pipe at home, if you step out in a cloud of vapor, it will be pretty obvious what you were doing and you know how some flight attendants can get snippy after dealing with passengers all day. And no the smoke detector wont go off, Don't blow directly at it and test this, but we haven't had one go off from a vaper. As a side note, most people get sleepy when they spend a few hours up at 7-9thousand feet and that makes you less of a nuisance to the crew. Besides dealing with the
Thousand
Standing
Around and the typical airline BS, now you know one of the many reasons you are exhausted after flying anywhere commercial. If you can afford it, the fractionals are a much better way to fly. They will feed you too and you wont get treated like cattle. (which is really what we think of you)
Best wishes.